Abstract
The primary Al- Fe- Si particles formed during solidification of commercial Al alloys may have considerable influence on fabrication properties. A variety of stable and metastable phases occur, depending upon alloy composition and solidification rate. Crystal structures are known only for some of the phases. The particles found after DC-casting of a commercially pure Al-0.25% Fe-0.13% Si alloy have been examined. TEM specimens were prepared both by foil-thinning and by a novel extraction technique where the matrix is dissolved in butanol. In samples taken from selected positions in the ingot corresponding to different solidification rates, the most common phases were identified by selected-area diffraction as bcc α- Al- Fe- Si, Al 3 Fe, bct Al m Fe and the complicated “ Al x Fe” particles. Other phases were found in minor quantities. Composition of the particles was determined by energy-dispersive X-ray analysis. High-resolution electron microscopy, selected-area and convergent-beam diffraction were used for confirmation and determination of Bravais lattices, space groups and several fault structures. The space group 14/mmm is proposed for Al m Fe.
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